Preparation method of polyethylene composition for bottle cap
A technology of polyethylene and composition, applied in the field of preparation of polyethylene composition, to achieve the effects of accelerated dissolution, wide application range, and favorable promotion and application
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[0041] Example 1
[0042] Weigh 50kg polyethylene powder (density 0.955g / cm 3 , Melt flow rate 0.5g / 10min), 25g antioxidant 1010, 50g antioxidant 168, 25g halogen absorbent calcium stearate, 500g medical stone (granularity 2500 mesh), after stirring fully mixed, add A twin-screw extruder with an L / D ratio of 48:1, a feeding speed of 50g / min, and a screw speed of 100 rpm; supercritical carbon dioxide fluid is added to the extruder from the second heating zone of the twin-screw extruder After leaving the machine, the mass of the supercritical carbon dioxide fluid is 20% of that of the polyethylene, and the addition rate is 10 g / min. The twin-screw extruder is divided into 10 heating zones, among which the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C to 200°C. Vacuum devolatilization in the 8th zone, the extruded pellets are water-cooled and pelletized to obtain the product.
Example Embodiment
[0043] Example 2
[0044] Weigh 50kg polyethylene powder (density 0.956g / cm 3 , Melt flow rate 1.5g / 10min), 50g antioxidant 1010, 100g antioxidant 168, 25g halogen absorbent calcium stearate, 1500g medical stone (granularity 2500 mesh), 25g fluoroelastomer, After stirring and mixing thoroughly, add a twin-screw extruder with a length-to-diameter ratio L / D of 48:1, a feeding speed of 50g / min, and a screw speed of 100 rpm; the supercritical carbon dioxide fluid flows from the first part of the twin-screw extruder Two heating zones are added to the extruder, the mass of the supercritical carbon dioxide fluid is 10% of the mass of the polyethylene, and the addition rate is 5 g / min. The twin-screw extruder is divided into 10 heating zones, among which the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C to 200°C. Vacuum devolatilization in the 8th heating zone, extrude the pelletized strips and then water-cooled pelletizing to ob...
Example Embodiment
[0045] Example 3
[0046] Weigh 50kg polyethylene powder (density 0.955g / cm 3 , Melt flow rate 2.5g / 10min), 75g antioxidant 1076, 100g antioxidant 168, 50g halogen absorbent calcium stearate, 2500g medical stone (granularity 2500 mesh), 50g fluoroelastomer, After stirring and mixing thoroughly, add a twin-screw extruder with a length-to-diameter ratio L / D of 48:1, a feeding speed of 50g / min, and a screw speed of 100 rpm; the supercritical carbon dioxide fluid flows from the first part of the twin-screw extruder Two heating zones are added to the extruder, the mass of the supercritical carbon dioxide fluid is 30% of the mass of the polyethylene, and the addition rate is 15 g / min. The twin-screw extruder is divided into 10 heating zones, among which the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C to 210°C. Vacuum devolatilization in the 8th heating zone, extrude the pelletized strips and then water-cooled pelletizing to o...
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